Low drop fixed and adjustable positive voltage regulators LD1117A

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LD1117A

Low drop fixed and adjustable positive voltage regulators

Datasheet

-

production data

Features

• Low dropout voltage:

– 1.15 V typ. @ I_OUT = 1 A, 25 °C

• Very low quiescent current:

– 5 mA typ. @ 25 °C

• Output current up to 1 A

• Fixed output voltage of:

– 1.2 V, 1.8 V, 3.3 V

• Adjustable version availability (V_REF = 1.25 V)

• Internal current and thermal limit

• Only 10 µF for stability

• Available in ± 2% (at 25 °C) and 4% in full temperature range

• High supply voltage rejection:

– 80 dB typ. (at 25 °C)

• Temperature range: 0 °C to 125 °C

Description

The LD1117A is a low drop voltage regulator able to provide up to 1 A of output current, available also in adjustable versions (V_REF = 1.25 V). In fixed versions, the following output voltages are offered: 1.2 V, 1.8 V, and 3.3 V. The device is supplied in: SOT-223, DPAK and TO-220. Surface mounted packages optimize the thermal

characteristics while offering a relevant space saving advantage. High efficiency is assured by an NPN pass transistor. Only a very common 10 µF minimum capacitor is needed for stability. Chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 2% at 25 °C.

TO-220

SOT-223

DPAK

Table 1. Device summary Order codes

Output voltage

SOT-223 DPAK TO-220

LD1117AS12TR LD1117ADT12TR 1.2 V

LD1117AS18TR LD1117ADT18TR 1.8 V

LD1117AS33TR LD1117ADT33TR LD1117AV33 3.3 V

LD1117ASTR LD1117ADT-TR Adjustable from 1.25 V

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Contents LD1117A

1 Diagram . . . 3

2 Pin configuration . . . 4

3 Maximum ratings . . . 5

4 Schematic application . . . 6

5 Electrical characteristics . . . 7

6 Typical application . . . 10

7 LD1117A adjustable: application note . . . 12

8 Package mechanical data . . . 13

9 Packaging mechanical data . . . 19

10 Revision history . . . 23

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LD1117A Diagram

1 Diagram

Figure 1. Block diagram

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Pin configuration LD1117A

2 Pin configuration

Note: The TAB is connected to the V_OUT.

Figure 2. Pin connections (top view)

DPAK SOT-223

TO-220 ADJ/GND VOUT

1

VIN

2 3 ADJ/GND

VOUT

1

V^IN 2

3

ADJ/GND OUTPUT

INPUT

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LD1117A Maximum ratings

3 Maximum ratings

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these condition is not implied. Beyond the above suggested max. power dissipation, a short-circuit may permanently damage the device.

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V_IN DC input voltage 15 V

P_D Power dissipation 12 W

T_STG Storage temperature range -40 to +150 °C

T_OP Operating junction temperature range 0 to +125 °C

Table 3. Thermal data

Symbol Parameter SOT-223 DPAK TO-220 Unit

R_thJC Thermal resistance junction-case 15 8 5 °C/W

R_thJA Thermal resistance junction-ambient 110 100 50 °C/W

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Schematic application LD1117A

4 Schematic application

Figure 3. Application circuit (for fixed output voltages)

A

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LD1117A Electrical characteristics

5 Electrical characteristics

Refer to the test circuits, T_J= 0 to 125 °C, C_O = 10 µF, C_I = 10 µF, R = 120 Ω between OUT- GND, unless otherwise specified.

Refer to the test circuits, T_J = 0 to 125 °C, C_O = 10 µF, C_I = 10 µF, unless otherwise specified.

Table 4. Electrical characteristics of LD1117A#12

Symbol Parameter Test conditions Min. Typ. Max. Unit

V_O Output voltage V_I= 5.3 V, I_O = 10 mA, T_J = 25 °C 1.176 1.2 1.224 V V_O Output voltage I_O = 0 to 1 A, V_I = 2.75 to 10 V 1.152 1.2 1.248 V

ΔV_O Line regulation V_I = 2.75 to 8 V, I_O = 0 mA 1 6 mV

ΔV_O Load regulation V_I = 2.75 V, I_O = 0 to 1 A 1 10 mV

ΔV_O Temperature stability 0.5 %

ΔV_O Long term stability 1000 hrs, T_J = 125 °C 0.3 %

V_I Operating input voltage I_O = 100 mA 10 V

I_d Quiescent current V_I≤ 8 V, I_O = 0 mA 5 10 mA

I_O Output current V_I - V_O= 5 V, T_J = 25 °C 1000 1200 mA

eN Output noise voltage B = 10 Hz to 10 kHz, T_J = 25 °C 100 µV

SVR Supply voltage rejection I_O = 40 mA, f = 120 Hz

V_I- V_O= 3 V, V_ripple = 1 V_PP 60 80 dB

V_D Dropout voltage

I_O = 100 mA 1 1.10

V

I_O = 500 mA 1.05 1.15

I_O = 1 A 1.15 1.30

ΔV_O(pwr) Thermal regulation T_a = 25 °C, 30 ms pulse 0.08 0.2 %/W

V_O Output voltage V_I= 3.8 V, I_O = 10 mA, T_J = 25 °C 1.764 1.8 1.836 V V_O Output voltage I_O = 0 to 1 A, V_I = 3.3 to 8 V 1.728 1.872 V

I_O Output current V_I - V_O= 5 V, T_J = 25 °C 1000 mA

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Electrical characteristics LD1117A

Refer to the test circuits, T_J = 0 to 125 °C, C_O = 10 µF, C_I = 10 µF, unless otherwise specified.

eN Output noise voltage B = 10 Hz to 10 kHz, T_J = 25 °C 100 µV

V_D Dropout voltage

I_O = 100 mA 1 1.10

V

I_O = 500 mA 1.05 1.15

I_O = 1 A 1.15 1.30

Table 5. Electrical characteristics of LD1117A#18 (continued)

V_O Output voltage V_I= 5.3 V, I_O = 10 mA, T_J = 25 °C 3.234 3.3 3.366 V V_O Output voltage I_O = 0 to 1 A, V_I = 4.75 to 10 V 3.168 3.432 V

eN Output noise voltage B =10 Hz to 10 kHz, T_J = 25 °C 100 µV

V_D Dropout voltage

I_O = 100 mA 1 1.10

V

I_O = 500 mA 1.05 1.15

I_O = 1 A 1.15 1.30

Table 7. Electrical characteristics of LD1117A (adjustable)

V_REF Reference voltage V_I= 5.3 V, I_O = 10 mA, T_J = 25 °C 1.225 1.25 1.275 V V_REF Reference voltage I_O = 10 mA to 1 A, V_I = 2.75 to 10 V 1.2 1.3 V

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LD1117A Electrical characteristics

I_adj Adjustment pin current V_in≤ 10 V 60 120 µA

ΔI_adj Adjustment pin current

change V_in - V_O= 1.4 to 10 V, I_O = 10 mA to 1 A 1 5 µA

I_O(min) Minimum load current V_in = 10 V 2 5 mA

eN Output noise voltage B =10 Hz to 10 kHz, T_J = 25 °C 100 µV

V_D Dropout voltage

I_O = 100 mA 1 1.10

V

I_O = 500 mA 1.05 1.15

I_O = 1 A 1.15 1.30

Table 7. Electrical characteristics of LD1117A (adjustable) (continued)

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Typical application LD1117A

6 Typical application

Figure 4. Negative supply

LD1117A

V^OUT= - VOUT(NOM)

Figure 5. Circuit for increasing output voltage

LD1117A

V^OUT = V^OUT(NOM)+ (0 - 5V)

Figure 6. Voltage regulator with reference

LD1117A

V^OUT = V^OUT(NOM)+ Vz

Vz

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LD1117A Typical application

Figure 7. Post-regulated dual supply

LD1117A

V

OUT2

= V

OUT(NOM) 0.5 A

LD1117A V

OUT1

V

OUT3

= -V

OUT(NOM) 0.5 A

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LD1117A adjustable: application note LD1117A

7 LD1117A adjustable: application note

The LD1117A adjustable has a thermal stabilized 1.25 ± 0.012 V reference voltage between the OUT and ADJ pins. I_ADJ is 60 µA typ. (120 µA max.) and ΔI_ADJ is 1 µA typ. (5 µA max.).

R₁ is normally fixed to 120 Ω. From Figure 6 the following is obtained:

V_OUT = V_REF + R₂ (I_ADJ + I_R1) = V_REF + R₂ (I_ADJ +V_REF /R₁) = V_REF (1 + R₂ / R₁) + R₂ x I_ADJ.

In normal applications the R₂ value is in the range of a few kΩ, so the R₂ x I_ADJ product can not be considered in the V_OUT calculation; the above expression then becomes:

V_OUT = V_REF (1 + R₂ / R₁).

In order to have a better load regulation it is important to realize a good Kelvin connection of R₁ and R₂ resistors. In particular, the R₁ connection must be realized very close to the OUT and ADJ pins, while the R₂ ground connection must be placed as near as possible to the negative load pin. Ripple rejection can be improved by introducing a 10 µF electrolytic capacitor placed in parallel to the R₂ resistor (see Figure 8).

Figure 8. Adjustable output voltage application

LD1117A

Figure 9. Adjustable output voltage application with improved ripple rejection

LD1117A

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LD1117A Package mechanical data

8 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK^® packages, depending on their level of environmental compliance. ECOPACK^® specifications, grade definitions and product status are available at: www.st.com.

ECOPACK^® is an ST trademark.

Table 8. TO-220 SG (single gauge) mechanical data Dim.

mm

Min. Typ. Max.

A 4.40 4.60

b 0.61 0.88

b1 1.14 1.70

c 0.48 0.70

D 15.25 15.75

E 10 10.40

e 2.40 2.70

e1 4.95 5.15

F 0.51 0.60

H1 6.20 6.60

J1 2.40 2.72

L 13 14

L1 3.50 3.93

L20 16.40

L30 28.90

∅

^P ^3.75 ^3.85

Q 2.65 2.95

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Package mechanical data LD1117A

Figure 10. TO-220 SG (single gauge) drawing

BUHY'

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Figure 11. SOT-223 mechanical data drawing Table 9. SOT-223 mechanical data Dim.

mm

Min. Typ. Max.

A 1.80

A1 0.02 0.1

B 0.60 0.70 0.85

B1 2.90 3.00 3.15

c 0.24 0.26 0.35

D 6.30 6.50 6.70

e 2.30

e1 4.60

E 3.30 3.50 3.70

H 6.70 7.00 7.30

V 10°

0046067_M

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Table 10. DPAK (TO-252) mechanical data Dim.

mm

Min. Typ. Max.

A 2.20 2.40

A1 0.90 1.10

A2 0.03 0.23

b 0.64 0.90

b4 5.20 5.40

c 0.45 0.60

c2 0.48 0.60

D 6.00 6.20

D1 5.10

E 6.40 6.60

E1 4.70

e 2.28

e1 4.40 4.60

H 9.35 10.10

L 1.00 1.50

(L1) 2.80

L2 0.80

L4 0.60 1.00

R 0.20

V2 0° 8°

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Figure 12. DPAK (TO-252) drawing

0068772_K

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Figure 13. DPAK footprint ^(a)

a. All dimensions are in millimeters

Footprint_REV_K

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LD1117A Packaging mechanical data

9 Packaging mechanical data

Figure 14. Tape for SOT-223 (dimensions are in mm) Table 11. SOT-223 tape and reel mechanical data

Tape Reel

Dim.

mm

Dim.

mm

Min. Typ. Max. Min. Max.

A0 6.75 6.85 6.95 A 180

B0 7.30 7.40 7.50 N 60

K0 1.80 1.90 2.00 W1 12.4

F 5.40 5.50 5.60 W2 18.4

E 1.65 1.75 1.85 W3 11.9 15.4

W 11.7 12 12.3

P2 1.90 2 2.10 Base quantity pcs 1000

P0 3.90 4 4.10 Bulk quantity pcs 1000

P1 7.90 8 8.10

T 0.25 0.30 0.35

D

f

1.50 1.55 1.60

D1

f

^1.50 ^1.60 ^1.70

* Cumulative tolerance of 10 sprocket holes is ±0.20 mm

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Packaging mechanical data LD1117A

Figure 15. Reel for SOT-223 (dimensions are in mm)

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LD1117A Packaging mechanical data

Table 12. DPAK tape and reel mechanical data

Tape Reel

Dim.

mm

Dim.

mm

Min. Max. Min. Max.

A0 6.8 7 A 330

B0 10.4 10.6 B 1.5

B1 12.1 C 12.8 13.2

D 1.5 1.6 D 20.2

D1 1.5 G 16.4 18.4

E 1.65 1.85 N 50

F 7.4 7.6 T 22.4

K0 2.55 2.75

P0 3.9 4.1 Base qty. 2500

P1 7.9 8.1 Bulk qty. 2500

P2 1.9 2.1

R 40

T 0.25 0.35

W 15.7 16.3

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Packaging mechanical data LD1117A

Figure 16. Tape for DPAK

Figure 17. Reel for DPAK

A0 P1 D1

P0

F W E D

K0 B0 T

User direction of feed

P2 10 pitches cumulative

tolerance on tape +/- 0.2 mm

User direction of feed

R

Bending radius B1

For machine ref. only including draft and radii concentric around B0

AM08852v1 Top cover

tape

A

D

B

Full radius G measured at hub

C

N REEL DIMENSIONS

40mm min.

Access hole At sl ot location

T

Tape slot in core for

tape start 25 mm min.

width

AM08851v2

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LD1117A Revision history

10 Revision history

Table 13. Document revision history

Date Revision Changes

29-Sep-2004 11 Add new part number.

12-Oct-2004 12 Mistake V_O max. - Table 4.

21-Apr-2005 13 Add new package - D²PAK/A.

05-Jul-2005 14 The DPAK mechanical data updated.

10-Feb-2006 15 Add new package - D²PAK/A (B type).

20-Dec-2006 16 Change value V_IN on Table 2.

19-Jan-2007 17 D²PAK/A mechanical data updated and add footprint data.

28-May-2007 18 Add I_ADJ and ΔI_ADJ values on Table 7.

07-Jun-2007 19 Add I_O(min) value on Table 7.

15-Apr-2008 20 Modified: Table 10.

28-Jul-2009 21 Modified: Table 10.

05-Jul-2010 22 Added: Table 8 on page 15, Figure 14 on page 18, Figure 15 on page 20, Figure 16 and Figure 17 on page 21.

16-Nov-2010 23 Modified: Table 1 on page 1, R_thJC value for TO-220 Table 3 on page 5.

16-Dec-2011 24 Modified: V_O parameter output voltage ==> Reference voltage Table 7 on page 8.

19-Oct-2012 25 Added: R_thJA value for DPAK and SOT-223 Table 3 on page 5.

24-Jul-2013 26

Part numbers LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX changed to LD1117A.

Modified Chapter 6: Typical application.

Changed Vo symbol in to V_REF in Table 7: Electrical characteristics of LD1117A (adjustable).

Updated Chapter 8: Package mechanical data.

Added Chapter 9: Packaging mechanical data.

Minor text changes.

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LD1117A

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